Re: Paper/Oil Capacitors

["Duke, Ronn (CCI-San Diego CCC)" <Ron.Duke-at-cox-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

>>Snip <<
>>I thought it would be a good idea to make a rolled poly cap with
paper-poly-paper layers. I figure >>this would help keep the heat and corona
away from the poly that would prompt premature failure, >>and also improve
the voltage rating and dielectric properties.

>> Reply Snip <<
>your idea of using paper, poly, paper is a very good one. I wish I would
>have thought of it a year ago.
>One thing though, wood pulp dissolves in oil after a time. that is why
>you use paper towels to clean the inside of an engine block before
>rebuilding, not a rag.
>but when I was in drafting at V.O. Tech (back before cad), we used a lot
>of velum, I'm not sure what it was made out of but it seemed to be some
>kind of impregnated paper?

I wouldn't be surprised that wood doesn't last long in motor oil. Petroleum
based oils you add detergents, ashless dipersants,(keeps carbon particles in
suspension), anti-foaming agents, acid neutralizers, flash suppression
agents, etc.  You get the picture. I would think that paper would fare much
better in pure mineral oil or transformer oil because of lack of chemical
additives.

Comments?


Thank you,

Ronn Duke	
Cox  Communications
Customer  Care  Center
Ex. 3485